Gas range



July 21, 1925. c. R. GRAHAM GAS RANGE Filed June 25. 1924 Ilma/1601? Patented July Z1, 19.25.

UNITED STATES PATENT OFFICE.

CLARENCE B1. GRAHAM, 0F SAN ERANCISCO, CALIFORNIA, ASSIGNOR TO JAMES GRA- HAM MANUFACTURING G0., OF 'SAN FRANCISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA.

GAS RANGE.

Application lcd. June 23, 1924. Serial No. 721,621.`

To all whom t may concern:

Be it known that I, CLARENCE R. GRAHAM, a citizen of the United States, residing in the city and county of San Francisco and State of California, have invented new and useful Improvements in Gas Ranges, of which the following is a specihcation.

This invention relates to gas ranges and particularly to such ranges ofthe closed top type, as distinguished from those having an open or grating top plate above the gas burners. Ranges of the latter type are most commonand it is obvious that in such ranges the open top permits free passage of air r therethrough to the burners. Ranges of the closed type, however, must receive their supe ply of air from another source. As thus far devised such ranges have been constructed to receive the air to the burner chamber solely through the frontof the range. As thusconstructedinsufficient air is supplied to the burners and particularly to the rear burners for supporting complete combustion. This condition results in great inefficiency, loss of heat and considerable danger due to the formation of carbon monoxid gases. The primary object of my invention is to provide an improved gas range wherein these objects are entirely eliminated.

More lspecifically it is an object of my invention to provide an improved gas range having a warming oven beneath the burner chamber and an opening in the partition between the oven and burner chamber beneath each burner through which openings air is supplied directly to the burners in a manner to support complete combustiom'thus securing efficient operation of the burners and eliminating formation of poisonous gases.

Another object of my invention is to provide a closed grid top plate for a gas range with a downwardly extending flange or baifleplate about certain of the grid openings whereby 'thelgasy burners therein are protected from interference by air currents and adjacent burners.

`"With the above and other objects in view, my invention'consists in the features of construction and operation setV forth in the following specification and illustrated in the accompanying` drawing. y In such drawingannexed` hereto and forming apart of this specification, I have shown certain specific embodiments of my invention, but it will be understood that the invention can be otherwise embodied and that the drawing is not to be construed as limiting the scope of the invention, the claims appended to this specification being relied upon for that purpose.

Referring to the figures of the drawing:

Fig. l is a transverse sectional view through a gas range embodying my invention, this view being taken approximately on line 1*l of Fig. 2.

Fig. 2 is a fragmentary plan view thereof.

Fig. 3 is an inverted perspective view of the top plate of the range.

Referring more specifically to the drawing by reference characters, l indicates the body portion of my improved range supported on legs 9.. As illustrated this body comprises a warming oven 3, combustion chamber 4, and a top or grid plate 5. The oven may be provided with a closure door 6 at the front of the range, and the top plate is provided with a plurality of grid openings 7 therein, each adapted to receive a closure grid 8. Two of the said openingsa are at the front of the range and t-he other two 7b are at the rear thereof. A gas burner 9 is mounted in the combustion chamber 4 beneath each grid opening 7.

lWhen using the range with the grid openings 7 closed, either by the grids 8 or by cooking utensilsl seated on the top plate over the openings, the top plate is entirely closed and air must be supplied to the burners from beneath. Heretofore the opening 10 at the front ofthe combustion chamber has been solely relied upon to supply this air. The front burners 7a, being near the air inlet, have obtained suiicient air in this manner to operate to a fair degree of satisfaction. The supply of air or oxygen to the rear burners,r however, has been so limited that such burners have operated very'ineiciently and with considerable danger.

It will be understood that air entering the combustion chamber 4 through the opening 10 thereof comes first to the front burners which absorb most of theoxygen there from. The resulting gases pass therefrom rearwardly and the rear burners must depend onA these gases for their supply of oxygen. Obviously these rear burners will operate at only partial combustion, thus resulting in agreat heat loss and the formation of poisonous fumes known as carbon monoxide gas. It may furthermore be stated that the air entering from thevfront and passing' rearwardly in the manner in described causes a draftwhich. considerably interferes with the proper operation ot the rear burners. 1When using Vboth the 'front and rear burners with theV top plate 5 entirely closed the supply ot oxygen to the rear burners and the interference oli air currents thereover have been known to become so pronounced as to entirely extinguish the flames ot such rear burners. lt is one object of this invention to provide a range wherein these objections are eliminated, and my improved construction, whereby such object is accomplished, will now be described'.

rPhe bottom plate 11 ot the combustionv chamber 4 is the top plateo't the wl'armina` oven 3, such plate providing' a wall between these two chambers. To provide each burner 9 with sufficient air forcemplete combustion, l form a plurality ot openings l2 in this plate. TEreterably, as illustrated, I provide one sueh opening; in the plate directly beneath each burner. In such construction the air enters the burner trom beneath, instead of from the side as heretofore, and causes the flame to burnV upwardly onto the grid without interference by laterally moving air currents. Such operation not only lrovides a more complete combustion, but also places the flames up into the openings 7 where their heat absorbed with the greatest c'tlieieucy. To furthermore facilitate this action, l preterably provide a flange 1S around each opening' l2, such tlanae preferably evtending.;- upwardly toward its burner. lf o still turther facilitatethe operation of the burners, l mayV provide openings 141- and 15 through the back wall ot the range. The openins 14.- Aenter the oven 3 and'permit air to enter thereinto and the openings l5 enter the com-- bastion chamber 4 and permit the burned gases to escape therefrom.

As has been heretofore stated, the moveA ment ot' the burned rearwardly have heretofore caused the trout burners to interfere with the proper operation ot the rear burners. To prevent such action, l provide a downwardly extending' ljlanne or batl'le plate 1G about each rear opening' Tl) between such opening' and the adjacent 't'ront opening: T'W. These battle plates are preferably bolted to the top plate 5 illurr' trat-ed. It will be understood that there plates deflect the gases around the rear burners and prevent draft interference therewith from the tront burners. This aetion will be clear byre'l'erring to Figs. l and 2 ot the drawing. Y Y

Having; thus described my invention, what I claim and desire to secure by Letters Patent is:

l. A gas range comprising' a body portion supported by legs, a closed top plate supported on the body and having a plu-- rality ot removable grids, a gas burner beneath and closely adiacent each grid, and a bottom plate beneath the top plate and burners providing a single combustion chamber in which the` burners are housed, the bottom plate having' an opening;l therethrough beneath each burner to permit the passage ot air upwardly therethrough to the burners.

Q. gas range. comprising a body portion supported by leps, closed top plate supported on the body and having` a plurality of removable `grids, a ,das burner beneath and closely adjacent each grid, a bottom plate beneath the top plate and burners providing a single combustion chamber in which the burners are housed, the bottom plate harina' an opening' therethrough beneath ea lh lnirner to permit the passage ot air upwardly therethrough to the burners. and an upwardly extendingflange tormed integjral with and surrounding each ot said openings beneath each burner tor directina` the air upwardly to the burners.

3. A gas range comprising1 a body portion supported by legs, a closed top plate supported on the body and having' a plurality ot ren'uwable grids, a bottom plate beneath the top plate and burners providimfl` a single combustion chamber', a gas burner in the chamber beneath each grid and closer to the grid than to said bottom plate, a chamber beneath the bottom plate, the bottom plate having' an opening' therethrough beneath each burner to permit the passage ot air upwardly therethrough to the burners, and an upwardly extending; `flange connected to and surrounding' each ot said openings beneath each burner for directing the ain` upwardly to the burners.

il. A (fas range comprising` a body portion supported by legs, a warmingoven and a single combustion chamber in the body portion, a closed top plate supported on the body above the combustion.chamber and having` a plurality of removable grids` a wall beneath the top plate providing,T a partition between the warming oven and the combustion chamber, and a `njas burner in the combustion chamber' beneath each grid, the partition wall havingan opening therethrough beneath each. burner to permit the passage ot air rupwardly theretlnoug'h to the burners.

5. A gas range comprising a body portion supported by legs, a warmingoven in the body portion, a top plate supported on the body above the oven and having a plurality ot removable grids, a gas burner beneath each grid, and a bottom plate beneath the top plate and burners providing' a partition between the warming oven and the burner chamber, the bottom plate having openings therethrough tor permitting the passage of llt) air to the burners and the back wall or' the body portion having openings therethrough into the warming oven and burner chamber to respectively permit the passage of air into the oven and out of the burner chamber.

6. A gas range comprising a body portion having a single housed combustion chamber therein, a top plate supported on a body over the chamber and having a plurality ofover a gas burner, and curved langes con nected to the plate respectively adjacent the edges oi certain ot the openings and eX- tending downwardly therefrom and partially surrounding the openings between such openings and the adjacent openings to protect each of such burners from interference by an adjacent burner.

8. A gas range comprising va body portion having a single housed combustion chamber therein, a top plate supported on the body portion or the chamber and having front and rear openings therein each superimposed over a gas burner, and a curved flange connected to the plate adjacent the edge of the rear opening and extending downwardly therefrom and partially surrounding the rear opening between such opening and the front opening to protect the rear burner from interference by the front burner.

CLARENCE R. GRAHAM. 

